Falcom Sound Team jdk completely re-recorded this and it shows in every single note. The Ao no Kiseki Evolution OST takes what was already one of the strongest Crossbell arc scores and gives it a full live instrumentation overhaul for the Vita.
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Seize the Truth! goes from solid synth-rock to this blazing guitar-driven battle theme that absolutely rips. Concentrate All Firepower!! layers horns and strings in ways the PSP hardware could only dream about. Then you hit Silence in the Sunlight Filtering Through Trees and the whole thing just breathes, warm acoustic guitar over soft pads.
Conflicting Passions though. If you played Zero and never followed up with Ao, the soundtrack alone should convince you.